WASHINGTON (CBS/AP) — Struggling to break an impasse, Republicans followed through on their threats to block President Obama’s nominee for secretary of defense Chuck Hagel.

Hours of behind-the-scenes talks yielded the decision by Senate Majority Leader Harry Reid, it appeared no clear sign of whether President Barack Obama’s nominee would receive the 60 votes required to move the Senate to a final vote on whether to confirm him. Democratic officials said the vote was scheduled with only a handful of votes needed to clear the threshold.

Despite a definitive final vote count, Sen. Reid stated that Republicans have followed through on threats to filibuster Hagel’s confirmation vote.

“It is tragic that they have decided to filibuster this qualified nominee,” said Reid. “It is really unfortunate.”

The importance of Reid’s announcement wasn’t immediately clear because he did not indicate whether or not Democrats had the 60 votes needed to overcome a Republican filibuster attempt.

“This isn’t high school getting ready for a football game, or some play being produced at a high school,” said Reid. “In less than two hours, our country will be without a secretary of defense.”

Sen. John McCain of Arizona led the opposition to Hagel’s confirmation, but he said he would not object to the test vote, called cloture.

The remaining “yes” votes remain elusive, even after the White House responded to McCain’s demand for information unrelated to Hagel. McCain and Sens. Lindsey Graham of South Carolina and Kelly Ayotte of New Hampshire said they would delay the vote until they got a more detailed accounting of Obama’s actions on the night of the attack on the U.S. diplomatic mission in Benghazi, Libya, where Ambassador Chris Stevens and three other Americans were killed. Republicans have sought to portray Obama as being out of touch during the raid and demanded to know whether Obama spoke to any Libyan official during the Sept. 11 assault.

The Republicans’ demand has had the effect of a filibuster.

The White House responded Thursday by saying former Secretary of State Hillary Clinton called Libyan President Mohamed Magariaf on Obama’s behalf on Sept. 11 to coordinate additional support to protect Americans in Libya, White House counsel Kathryn Ruemmler wrote the senators. Obama spoke to Magariaf on the evening of Sept. 12, she said.

The Obama administration also had disclosed the calls at the time they were made.

A White House official said Thursday that if there had been a need to push the Libyans to do something, Obama would have called, but the official said the Libyans were trying to do the right thing and were being as helpful as possible. Moreover, the official, discussing internal communications only on the condition of anonymity, said the earlier call with Clinton had gone well.

Reid said it was “shocking” and “tragic” that the GOP would attempt to block Hagel’s nomination at a time when the U.S. military is engaged in so many places around the world. “Not a single nominee for secretary of defense ever in the history of our country has been filibustered,” he said in a speech on the Senate floor.

Reid said Republicans notified him Wednesday night they would withhold the votes needed to advance Hagel’s nomination. Reid said he considered that a “full-scale filibuster” because the Republican strategy would prevent Hagel’s nomination from getting the required 60 votes.

Republicans are seeking “extraneous requests” for information that will never be satisfied, Reid said. “The pattern has been clear for months: as soon as President Obama’s administration responds to one request, Republicans devise another, more outlandish request,” Reid said.

A full Senate vote on Hagel, a former two-term Republican senator from Nebraska and twice-wounded Vietnam veteran, was expected to be held Friday after Reid filed a motion to limit debate. While Democrats hold a 55-45 edge in the Senate and have the numbers to confirm Hagel on a majority vote, they need the support of five Republicans to clear the way for a majority vote.

Two Republicans — Sens. Thad Cochran of Mississippi and Mike Johanns of Nebraska — have announced their support for Hagel. A third, Sen. Susan Collins of Maine, has said she will vote against Hagel’s confirmation, but would not join in a filibuster to block a final vote.

Graham said Wednesday that he would vote against ending debate on Hagel’s nomination.

“There seems to not be much interest to hold this president accountable for a national security breakdown that led to the first ambassador being killed in the line of duty in over 30 years,” Graham said. “No, the debate on Chuck Hagel is not over. It has not been serious. We don’t have the information we need. And I’m going to fight the idea of jamming somebody through until we get answers about what the president did personally when it came to the Benghazi debacle.”

McCain declined to say whether he would try to delay Hagel’s confirmation if Obama did not provide an answer. “My position right now is I want an answer to the question,” he said.

The nomination of John Brennan as CIA director is also being delayed; the Senate Intelligence Committee is pushing off a vote amid demands that the White House turn over more details about drone strikes against terror suspects and about the Benghazi attacks. Intelligence Committee Chairwoman Dianne Feinstein of California said a vote likely will be postponed till late February.

A bitterly divided Armed Services Committee on Tuesday voted to approve Hagel by a 14-11 vote, with all the panel’s Democrats backing him. The committee’s Republicans were unified in opposition to their onetime colleague, who will succeed Defense Secretary Leon Panetta if he’s confirmed.

Obama “stands strongly” behind Hagel and believes he “will do a wonderful job,” White House spokesman Josh Earnest said aboard Air Force One en route to Decatur, Ga., where the president traveled Thursday to speak about early childhood education.

If confirmed by the Senate, Hagel, 66, would take charge of the U.S. armed forces at a time of turmoil. Automatic cuts to the Pentagon’s budget are looming, American troops in Afghanistan are being halved over the next year, North Korea has tested a nuclear weapon, Iran remains a threat in the Persian Gulf region, and Syria, Iraq, Libya, Egypt, Mali and Tunisia all are in a state of unrest.

At a Pentagon award ceremony on Thursday for former Secretary of State Hillary Rodham Clinton, Panetta said it was fitting to recognize her accomplishments on Valentine’s Day. And he said the second-best Valentine’s Day present would be for the Senate to confirm Hagel and allow Panetta and his wife to “get the hell out of town.” He said he’s got his belongings packed.

Hagel has faced intense opposition from Republicans, who have challenged his past statements and votes on Israel, Iran, Iraq and nuclear weapons.